From  : John Doe <jdoe@machine(comment).  example>
To    : Mary Smith
__
          <mary@example.net>
Subject     : Saying Hello
Date  : Fri, 21 Nov 1997 09(comment):   55  :  06 -0600
Message-ID  : <1234   @   local(blah)  .machine .example>

This is a message just to say hello.
So, "Hello".

Appendix A.6.3.  Obsolete White Space and Comments

   White space and comments can appear between many more elements than
   in the current syntax.  Also, folding lines that are made up entirely
   of white space are legal.

